diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..6313b56
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1 @@
+* text=auto eol=lf
diff --git a/analyzing/analyzing.go b/analyzing/analyzing.go
index 80fb652..904fe10 100644
--- a/analyzing/analyzing.go
+++ b/analyzing/analyzing.go
@@ -3,7 +3,7 @@ package analyzing
 import (
 	"fmt"
 	"os"
-	"strings"
+	"path/filepath"
 
 	"embed-code/embed-code-go/configuration"
 	"embed-code/embed-code-go/embedding"
@@ -38,7 +38,7 @@ func AnalyzeAll(config configuration.Configuration) {
 
 // Generates a path to a given file in the analytics directory.
 func pathToFile(fileName string) string {
-	return fmt.Sprintf("%s/%s", analyticsDir, fileName)
+	return filepath.Join(analyticsDir, fileName)
 }
 
 // Finds all documentation files for given config.
@@ -47,12 +47,14 @@ func findDocumentationFiles(config configuration.Configuration) []string {
 	docPatterns := config.DocIncludes
 	var documentationFiles []string
 	for _, pattern := range docPatterns {
-		globString := strings.Join([]string{documentationRoot, pattern}, "/")
+		globString := filepath.Join(documentationRoot, filepath.FromSlash(pattern))
 		matches, err := doublestar.FilepathGlob(globString)
 		if err != nil {
 			panic(err)
 		}
-		documentationFiles = append(documentationFiles, matches...)
+		for _, match := range matches {
+			documentationFiles = append(documentationFiles, filepath.ToSlash(match))
+		}
 	}
 
 	return documentationFiles
diff --git a/embedding/embedding_test.go b/embedding/embedding_test.go
index 7262c4e..0463ef7 100644
--- a/embedding/embedding_test.go
+++ b/embedding/embedding_test.go
@@ -107,6 +107,42 @@ var _ = Describe("Embedding", func() {
 		Expect(processor.IsUpToDate()).Should(BeTrue())
 	})
 
+	It("should embed with multi lined tag attributes", func() {
+		docPath := fmt.Sprintf("%s/multi-lined-valid-tag-attributes.md", config.DocumentationRoot)
+		processor := embedding.NewProcessor(docPath, config)
+		Expect(processor.Embed()).Error().ShouldNot(HaveOccurred())
+
+		Expect(processor.IsUpToDate()).Should(BeTrue())
+	})
+
+	It("should report a missing closing tag", func() {
+		docPath := fmt.Sprintf("%s/missing-closing-tag.md", config.DocumentationRoot)
+		processor := embedding.NewProcessor(docPath, config)
+
+		_, err := processor.Embed()
+
+		Expect(err).Should(HaveOccurred())
+		Expect(err.Error()).Should(ContainSubstring(
+			"missing-closing-tag.md:3`: " +
+				"failed to parse an embedding instruction: " +
+				"the `<embed-code>` tag is not closed",
+		))
+	})
+
+	It("should report the XML parser error", func() {
+		docPath := fmt.Sprintf("%s/unclosed-nested-tag.md", config.DocumentationRoot)
+		processor := embedding.NewProcessor(docPath, config)
+
+		_, err := processor.Embed()
+
+		Expect(err).Should(HaveOccurred())
+		Expect(err.Error()).Should(ContainSubstring(
+			"unclosed-nested-tag.md:3`: " +
+				"failed to parse an embedding instruction: " +
+				"element <unexpected> closed by </embed-code>",
+		))
+	})
+
 	// TODO:olena-zmiiova:https://github.com/SpineEventEngine/embed-code/issues/65
 	It("should successfully embed to a file in a nested dir", func() {
 		Skip(
diff --git a/embedding/parsing/constants.go b/embedding/parsing/constants.go
index e1f9110..325ad86 100644
--- a/embedding/parsing/constants.go
+++ b/embedding/parsing/constants.go
@@ -18,8 +18,8 @@
 
 package parsing
 
-// EmbeddingTag is a StartState of a tag where it requires to embed the code.
-const EmbeddingTag = "<embed-code"
+// EmbeddingTag is a name of a tag which marks where to embed the code.
+const EmbeddingTag = "embed-code"
 
 // TransitionMap is a type for mapping one State to a list of possible next States.
 type TransitionMap map[State][]State
diff --git a/embedding/parsing/instruction_token.go b/embedding/parsing/instruction_token.go
index 30efcea..b3234de 100644
--- a/embedding/parsing/instruction_token.go
+++ b/embedding/parsing/instruction_token.go
@@ -19,6 +19,8 @@
 package parsing
 
 import (
+	"encoding/xml"
+	"errors"
 	"fmt"
 	"strings"
 
@@ -28,6 +30,20 @@ import (
 // EmbedInstructionTokenState represents an embedding instruction token of a markdown.
 type EmbedInstructionTokenState struct{}
 
+// InstructionParseError reports a failed embedding instruction parse and its source line.
+type InstructionParseError struct {
+	Line   int
+	Reason string
+}
+
+// Error returns a user-facing description of an embedding instruction parse failure.
+func (e InstructionParseError) Error() string {
+	return fmt.Sprintf(
+		"failed to parse an embedding instruction: %s",
+		e.Reason,
+	)
+}
+
 // Recognize reports whether the current line in the parsing context starts with "<embed-code",
 // and if there is no ongoing embedding and the end of the file is not reached, it returns true.
 // Otherwise, it returns false.
@@ -35,7 +51,7 @@ type EmbedInstructionTokenState struct{}
 // context — a context of the parsing process.
 func (e EmbedInstructionTokenState) Recognize(context Context) bool {
 	line := context.CurrentLine()
-	isStatement := strings.HasPrefix(strings.TrimSpace(line), EmbeddingTag)
+	isStatement := strings.HasPrefix(strings.TrimSpace(line), "<"+EmbeddingTag)
 	if context.EmbeddingInstruction == nil && !context.ReachedEOF() && isStatement {
 		return true
 	}
@@ -54,20 +70,48 @@ func (e EmbedInstructionTokenState) Recognize(context Context) bool {
 func (e EmbedInstructionTokenState) Accept(context *Context,
 	config configuration.Configuration) error {
 	var instructionBody []string
+	startLine := context.CurrentIndex()
+	var parseErr error
 	for !context.ReachedEOF() && context.EmbeddingInstruction == nil {
-		instructionBody = append(instructionBody, context.CurrentLine())
+		line := context.CurrentLine()
+		instructionBody = append(instructionBody, line)
 
-		instruction, err := FromXML(strings.Join(instructionBody, ""), config)
+		instruction, err := FromXML(strings.Join(instructionBody, " "), config)
 		if err == nil {
 			context.SetEmbedding(&instruction)
+		} else {
+			parseErr = err
 		}
 
-		context.Result = append(context.Result, context.CurrentLine())
+		context.Result = append(context.Result, line)
 		context.ToNextLine()
 	}
 	if context.EmbeddingInstruction == nil {
-		return fmt.Errorf("failed to parse an embedding instruction. Context: %v", context)
+		return InstructionParseError{
+			Line:   startLine,
+			Reason: parseFailureReason(instructionBody, parseErr),
+		}
 	}
 
 	return nil
 }
+
+// parseFailureReason explains why an embedding instruction could not be parsed.
+func parseFailureReason(instructionBody []string, parseErr error) string {
+	instruction := strings.TrimSpace(strings.Join(instructionBody, " "))
+	if !strings.Contains(instruction, "/>") &&
+		!strings.Contains(instruction, "</"+EmbeddingTag+">") {
+		return fmt.Sprintf("the `<%s>` tag is not closed",
+			EmbeddingTag,
+		)
+	}
+	if parseErr != nil {
+		var syntaxErr *xml.SyntaxError
+		if errors.As(parseErr, &syntaxErr) {
+			return syntaxErr.Msg
+		}
+		return parseErr.Error()
+	}
+
+	return "invalid embedding instruction"
+}
diff --git a/embedding/parsing/xml_parse.go b/embedding/parsing/xml_parse.go
index 63840cc..4fe51b1 100644
--- a/embedding/parsing/xml_parse.go
+++ b/embedding/parsing/xml_parse.go
@@ -24,8 +24,6 @@ import (
 	"fmt"
 )
 
-const xmlStringHeader string = "embed-code"
-
 // Item needed for xml.Unmarshal parsing. The fields are filling up during the parsing.
 //
 // XMLName — a name of the tag in XML line.
@@ -74,9 +72,9 @@ func ParseXMLLine(xmlLine string) (map[string]string, error) {
 		return map[string]string{}, err
 	}
 
-	if root.XMLName.Local != xmlStringHeader {
+	if root.XMLName.Local != EmbeddingTag {
 		return map[string]string{},
-			fmt.Errorf("the provided line's header is not 'embed-code':\n%s", xmlLine)
+			fmt.Errorf("the provided line's header is not `%s`:\n%s", EmbeddingTag, xmlLine)
 	}
 
 	attributes := make(map[string]string)
diff --git a/embedding/processor.go b/embedding/processor.go
index 839fda0..b612947 100644
--- a/embedding/processor.go
+++ b/embedding/processor.go
@@ -217,13 +217,13 @@ func (p Processor) fillEmbeddingContext() (parsing.Context, error) {
 	for currentState != finishState {
 		accepted, newState, err := p.moveToNextState(&currentState, &context)
 		if err != nil {
-			return context, fmt.Errorf(errorStr, absDocPath, context.CurrentEmbedding().SourceStartIndex-1, err)
+			return context, fmt.Errorf(errorStr, absDocPath, errorLine(context, err), err)
 		}
 		if !accepted {
 			currentState = &parsing.RegularLineState{}
 			context.ResolveUnacceptedEmbedding()
 
-			return context, fmt.Errorf(errorStr, absDocPath, context.CurrentEmbedding().SourceStartIndex-1, err)
+			return context, fmt.Errorf(errorStr, absDocPath, errorLine(context, err), err)
 		}
 		currentState = *newState
 	}
@@ -231,6 +231,19 @@ func (p Processor) fillEmbeddingContext() (parsing.Context, error) {
 	return context, nil
 }
 
+// errorLine returns the source line that should be used in the embedding error location.
+func errorLine(context parsing.Context, err error) int {
+	var parseErr parsing.InstructionParseError
+	if errors.As(err, &parseErr) {
+		return parseErr.Line
+	}
+	if context.EmbeddingsCount() > 0 {
+		return context.CurrentEmbedding().SourceStartIndex - 1
+	}
+
+	return context.CurrentIndex()
+}
+
 // Moves to the next state accordingly to a transition map from the current state. Reports whether
 // it successfully moved to the next state and returns the new state.
 func (p Processor) moveToNextState(state *parsing.State, context *parsing.Context) (
@@ -289,12 +302,14 @@ func requiredDocs(config configuration.Configuration) []string {
 func getFilesByPatterns(root string, patterns []string) ([]string, error) {
 	var result []string
 	for _, pattern := range patterns {
-		globString := strings.Join([]string{root, pattern}, "/")
+		globString := filepath.Join(root, filepath.FromSlash(pattern))
 		matches, err := doublestar.FilepathGlob(globString)
 		if err != nil {
 			return nil, err
 		}
-		result = append(result, matches...)
+		for _, match := range matches {
+			result = append(result, filepath.ToSlash(match))
+		}
 	}
 
 	return result, nil
diff --git a/files/files.go b/files/files.go
index 78b9ec8..0464acd 100644
--- a/files/files.go
+++ b/files/files.go
@@ -90,7 +90,7 @@ func BuildDocRelativePath(absolutePath string, config configuration.Configuratio
 		panic(err)
 	}
 
-	return relativePath
+	return filepath.ToSlash(relativePath)
 }
 
 // EnsureDirExists creates dir at given path (relative or absolute) if it doesn't exist.
diff --git a/fragmentation/fragment_file.go b/fragmentation/fragment_file.go
index c3b465e..9794ca3 100644
--- a/fragmentation/fragment_file.go
+++ b/fragmentation/fragment_file.go
@@ -20,15 +20,16 @@ package fragmentation
 
 import (
 	"crypto/sha256"
-	_type "embed-code/embed-code-go/type"
 	"encoding/hex"
 	"fmt"
 	"os"
+	"path"
 	"path/filepath"
 	"strings"
 
 	config "embed-code/embed-code-go/configuration"
 	"embed-code/embed-code-go/files"
+	_type "embed-code/embed-code-go/type"
 )
 
 // FragmentFile is a file storing a single fragment from the file.
@@ -73,7 +74,9 @@ func NewFragmentFileFromAbsolute(
 	}
 
 	if strings.TrimSpace(codeRoot.Name) != "" {
-		relativePath = filepath.Join(NamedPathPrefix+codeRoot.Name, relativePath)
+		relativePath = path.Join(NamedPathPrefix+codeRoot.Name, filepath.ToSlash(relativePath))
+	} else {
+		relativePath = filepath.ToSlash(relativePath)
 	}
 
 	return FragmentFile{
@@ -143,10 +146,10 @@ func (f FragmentFile) absolutePath() string {
 	}
 
 	if f.FragmentName == DefaultFragmentName {
-		return filepath.Join(fragmentsAbsDir, f.CodePath)
+		return filepath.Join(fragmentsAbsDir, filepath.FromSlash(f.CodePath))
 	}
 
-	withoutExtension := strings.TrimSuffix(f.CodePath, fileExtension)
+	withoutExtension := filepath.FromSlash(strings.TrimSuffix(f.CodePath, fileExtension))
 	filename := fmt.Sprintf("%s-%s", withoutExtension, f.fragmentHash())
 
 	return filepath.Join(fragmentsAbsDir, filename+fileExtension)
diff --git a/main.go b/main.go
index d78aabf..f40913a 100644
--- a/main.go
+++ b/main.go
@@ -28,7 +28,7 @@ import (
 )
 
 // Version of the embed-code application.
-const Version = "1.1.0"
+const Version = "1.1.1"
 
 // The entry point for embed-code.
 //
diff --git a/test/resources/docs/missing-closing-tag.md b/test/resources/docs/missing-closing-tag.md
new file mode 100644
index 0000000..50d9df6
--- /dev/null
+++ b/test/resources/docs/missing-closing-tag.md
@@ -0,0 +1,5 @@
+# Test missing closing tag
+
+<embed-code file="org/example/Hello.java">
+```java
+```
diff --git a/test/resources/docs/multi-lined-valid-tag-attributes.md b/test/resources/docs/multi-lined-valid-tag-attributes.md
new file mode 100644
index 0000000..772e954
--- /dev/null
+++ b/test/resources/docs/multi-lined-valid-tag-attributes.md
@@ -0,0 +1,8 @@
+# Test multiline attributes
+
+<embed-code
+file="org/example/Hello.java"
+start="public class Hello"
+end="System.out.println" />
+```java
+```
diff --git a/test/resources/docs/unclosed-nested-tag.md b/test/resources/docs/unclosed-nested-tag.md
new file mode 100644
index 0000000..cbc1ff1
--- /dev/null
+++ b/test/resources/docs/unclosed-nested-tag.md
@@ -0,0 +1,5 @@
+# Test unclosed nested tag
+
+<embed-code file="org/example/Hello.java"><unexpected></embed-code>
+```java
+```